Function works on CodePen but not in Node?

I have this function :

let formatDate = (dt) => { 
    let date = new Date(dt).toLocaleDateString().replaceAll("/", ".") 
    return date + "."

The problem I have is that when I use it in Code Pen and on another computer it works just fine but when I use it on this PC, I get this error message:
TypeError: (intermediate value).toLocaleDateString(...).replaceAll is not a function.

replaceAll is new-ish, not sure which versions of Node supports it. I would have to check.

Edit: looks like 15.14.0 and above

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